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af_econet.c
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/*
* An implementation of the Acorn Econet and AUN protocols.
* Philip Blundell <philb@gnu.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/in.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/if_ether.h>
#include <linux/netdevice.h>
#include <linux/inetdevice.h>
#include <linux/route.h>
#include <linux/inet.h>
#include <linux/etherdevice.h>
#include <linux/if_arp.h>
#include <linux/wireless.h>
#include <linux/skbuff.h>
#include <linux/udp.h>
#include <net/sock.h>
#include <net/inet_common.h>
#include <linux/stat.h>
#include <linux/init.h>
#include <linux/if_ec.h>
#include <net/udp.h>
#include <net/ip.h>
#include <linux/spinlock.h>
#include <linux/rcupdate.h>
#include <linux/bitops.h>
#include <linux/mutex.h>
#include <asm/uaccess.h>
#include <asm/system.h>
static const struct proto_ops econet_ops;
static struct hlist_head econet_sklist;
static DEFINE_RWLOCK(econet_lock);
static DEFINE_MUTEX(econet_mutex);
/* Since there are only 256 possible network numbers (or fewer, depends
how you count) it makes sense to use a simple lookup table. */
static struct net_device *net2dev_map[256];
#define EC_PORT_IP 0xd2
#ifdef CONFIG_ECONET_AUNUDP
static DEFINE_SPINLOCK(aun_queue_lock);
static struct socket *udpsock;
#define AUN_PORT 0x8000
struct aunhdr
{
unsigned char code; /* AUN magic protocol byte */
unsigned char port;
unsigned char cb;
unsigned char pad;
unsigned long handle;
};
static unsigned long aun_seq;
/* Queue of packets waiting to be transmitted. */
static struct sk_buff_head aun_queue;
static struct timer_list ab_cleanup_timer;
#endif /* CONFIG_ECONET_AUNUDP */
/* Per-packet information */
struct ec_cb
{
struct sockaddr_ec sec;
unsigned long cookie; /* Supplied by user. */
#ifdef CONFIG_ECONET_AUNUDP
int done;
unsigned long seq; /* Sequencing */
unsigned long timeout; /* Timeout */
unsigned long start; /* jiffies */
#endif
#ifdef CONFIG_ECONET_NATIVE
void (*sent)(struct sk_buff *, int result);
#endif
};
static void econet_remove_socket(struct hlist_head *list, struct sock *sk)
{
write_lock_bh(&econet_lock);
sk_del_node_init(sk);
write_unlock_bh(&econet_lock);
}
static void econet_insert_socket(struct hlist_head *list, struct sock *sk)
{
write_lock_bh(&econet_lock);
sk_add_node(sk, list);
write_unlock_bh(&econet_lock);
}
/*
* Pull a packet from our receive queue and hand it to the user.
* If necessary we block.
*/
static int econet_recvmsg(struct kiocb *iocb, struct socket *sock,
struct msghdr *msg, size_t len, int flags)
{
struct sock *sk = sock->sk;
struct sk_buff *skb;
size_t copied;
int err;
msg->msg_namelen = sizeof(struct sockaddr_ec);
mutex_lock(&econet_mutex);
/*
* Call the generic datagram receiver. This handles all sorts
* of horrible races and re-entrancy so we can forget about it
* in the protocol layers.
*
* Now it will return ENETDOWN, if device have just gone down,
* but then it will block.
*/
skb=skb_recv_datagram(sk,flags,flags&MSG_DONTWAIT,&err);
/*
* An error occurred so return it. Because skb_recv_datagram()
* handles the blocking we don't see and worry about blocking
* retries.
*/
if(skb==NULL)
goto out;
/*
* You lose any data beyond the buffer you gave. If it worries a
* user program they can ask the device for its MTU anyway.
*/
copied = skb->len;
if (copied > len)
{
copied=len;
msg->msg_flags|=MSG_TRUNC;
}
/* We can't use skb_copy_datagram here */
err = memcpy_toiovec(msg->msg_iov, skb->data, copied);
if (err)
goto out_free;
sk->sk_stamp = skb->tstamp;
if (msg->msg_name)
memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
/*
* Free or return the buffer as appropriate. Again this
* hides all the races and re-entrancy issues from us.
*/
err = copied;
out_free:
skb_free_datagram(sk, skb);
out:
mutex_unlock(&econet_mutex);
return err;
}
/*
* Bind an Econet socket.
*/
static int econet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
{
struct sockaddr_ec *sec = (struct sockaddr_ec *)uaddr;
struct sock *sk;
struct econet_sock *eo;
/*
* Check legality
*/
if (addr_len < sizeof(struct sockaddr_ec) ||
sec->sec_family != AF_ECONET)
return -EINVAL;
mutex_lock(&econet_mutex);
sk = sock->sk;
eo = ec_sk(sk);
eo->cb = sec->cb;
eo->port = sec->port;
eo->station = sec->addr.station;
eo->net = sec->addr.net;
mutex_unlock(&econet_mutex);
return 0;
}
#if defined(CONFIG_ECONET_AUNUDP) || defined(CONFIG_ECONET_NATIVE)
/*
* Queue a transmit result for the user to be told about.
*/
static void tx_result(struct sock *sk, unsigned long cookie, int result)
{
struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
struct ec_cb *eb;
struct sockaddr_ec *sec;
if (skb == NULL)
{
printk(KERN_DEBUG "ec: memory squeeze, transmit result dropped.\n");
return;
}
eb = (struct ec_cb *)&skb->cb;
sec = (struct sockaddr_ec *)&eb->sec;
memset(sec, 0, sizeof(struct sockaddr_ec));
sec->cookie = cookie;
sec->type = ECTYPE_TRANSMIT_STATUS | result;
sec->sec_family = AF_ECONET;
if (sock_queue_rcv_skb(sk, skb) < 0)
kfree_skb(skb);
}
#endif
#ifdef CONFIG_ECONET_NATIVE
/*
* Called by the Econet hardware driver when a packet transmit
* has completed. Tell the user.
*/
static void ec_tx_done(struct sk_buff *skb, int result)
{
struct ec_cb *eb = (struct ec_cb *)&skb->cb;
tx_result(skb->sk, eb->cookie, result);
}
#endif
/*
* Send a packet. We have to work out which device it's going out on
* and hence whether to use real Econet or the UDP emulation.
*/
static int econet_sendmsg(struct kiocb *iocb, struct socket *sock,
struct msghdr *msg, size_t len)
{
struct sock *sk = sock->sk;
struct sockaddr_ec *saddr=(struct sockaddr_ec *)msg->msg_name;
struct net_device *dev;
struct ec_addr addr;
int err;
unsigned char port, cb;
#if defined(CONFIG_ECONET_AUNUDP) || defined(CONFIG_ECONET_NATIVE)
struct sk_buff *skb;
struct ec_cb *eb;
#endif
#ifdef CONFIG_ECONET_AUNUDP
struct msghdr udpmsg;
struct iovec iov[msg->msg_iovlen+1];
struct aunhdr ah;
struct sockaddr_in udpdest;
__kernel_size_t size;
int i;
mm_segment_t oldfs;
#endif
/*
* Check the flags.
*/
if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT))
return -EINVAL;
/*
* Get and verify the address.
*/
mutex_lock(&econet_mutex);
if (saddr == NULL) {
struct econet_sock *eo = ec_sk(sk);
addr.station = eo->station;
addr.net = eo->net;
port = eo->port;
cb = eo->cb;
} else {
if (msg->msg_namelen < sizeof(struct sockaddr_ec)) {
mutex_unlock(&econet_mutex);
return -EINVAL;
}
addr.station = saddr->addr.station;
addr.net = saddr->addr.net;
port = saddr->port;
cb = saddr->cb;
}
/* Look for a device with the right network number. */
dev = net2dev_map[addr.net];
/* If not directly reachable, use some default */
if (dev == NULL) {
dev = net2dev_map[0];
/* No interfaces at all? */
if (dev == NULL) {
mutex_unlock(&econet_mutex);
return -ENETDOWN;
}
}
if (len + 15 > dev->mtu) {
mutex_unlock(&econet_mutex);
return -EMSGSIZE;
}
if (dev->type == ARPHRD_ECONET) {
/* Real hardware Econet. We're not worthy etc. */
#ifdef CONFIG_ECONET_NATIVE
unsigned short proto = 0;
int res;
dev_hold(dev);
skb = sock_alloc_send_skb(sk, len+LL_ALLOCATED_SPACE(dev),
msg->msg_flags & MSG_DONTWAIT, &err);
if (skb==NULL)
goto out_unlock;
skb_reserve(skb, LL_RESERVED_SPACE(dev));
skb_reset_network_header(skb);
eb = (struct ec_cb *)&skb->cb;
/* BUG: saddr may be NULL */
eb->cookie = saddr->cookie;
eb->sec = *saddr;
eb->sent = ec_tx_done;
err = -EINVAL;
res = dev_hard_header(skb, dev, ntohs(proto), &addr, NULL, len);
if (res < 0)
goto out_free;
if (res > 0) {
struct ec_framehdr *fh;
/* Poke in our control byte and
port number. Hack, hack. */
fh = (struct ec_framehdr *)(skb->data);
fh->cb = cb;
fh->port = port;
if (sock->type != SOCK_DGRAM) {
skb_reset_tail_pointer(skb);
skb->len = 0;
}
}
/* Copy the data. Returns -EFAULT on error */
err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len);
skb->protocol = proto;
skb->dev = dev;
skb->priority = sk->sk_priority;
if (err)
goto out_free;
err = -ENETDOWN;
if (!(dev->flags & IFF_UP))
goto out_free;
/*
* Now send it
*/
dev_queue_xmit(skb);
dev_put(dev);
mutex_unlock(&econet_mutex);
return(len);
out_free:
kfree_skb(skb);
out_unlock:
if (dev)
dev_put(dev);
#else
err = -EPROTOTYPE;
#endif
mutex_unlock(&econet_mutex);
return err;
}
#ifdef CONFIG_ECONET_AUNUDP
/* AUN virtual Econet. */
if (udpsock == NULL) {
mutex_unlock(&econet_mutex);
return -ENETDOWN; /* No socket - can't send */
}
/* Make up a UDP datagram and hand it off to some higher intellect. */
memset(&udpdest, 0, sizeof(udpdest));
udpdest.sin_family = AF_INET;
udpdest.sin_port = htons(AUN_PORT);
/* At the moment we use the stupid Acorn scheme of Econet address
y.x maps to IP a.b.c.x. This should be replaced with something
more flexible and more aware of subnet masks. */
{
struct in_device *idev;
unsigned long network = 0;
rcu_read_lock();
idev = __in_dev_get_rcu(dev);
if (idev) {
if (idev->ifa_list)
network = ntohl(idev->ifa_list->ifa_address) &
0xffffff00; /* !!! */
}
rcu_read_unlock();
udpdest.sin_addr.s_addr = htonl(network | addr.station);
}
ah.port = port;
ah.cb = cb & 0x7f;
ah.code = 2; /* magic */
ah.pad = 0;
/* tack our header on the front of the iovec */
size = sizeof(struct aunhdr);
/*
* XXX: that is b0rken. We can't mix userland and kernel pointers
* in iovec, since on a lot of platforms copy_from_user() will
* *not* work with the kernel and userland ones at the same time,
* regardless of what we do with set_fs(). And we are talking about
* econet-over-ethernet here, so "it's only ARM anyway" doesn't
* apply. Any suggestions on fixing that code? -- AV
*/
iov[0].iov_base = (void *)&ah;
iov[0].iov_len = size;
for (i = 0; i < msg->msg_iovlen; i++) {
void __user *base = msg->msg_iov[i].iov_base;
size_t len = msg->msg_iov[i].iov_len;
/* Check it now since we switch to KERNEL_DS later. */
if (!access_ok(VERIFY_READ, base, len)) {
mutex_unlock(&econet_mutex);
return -EFAULT;
}
iov[i+1].iov_base = base;
iov[i+1].iov_len = len;
size += len;
}
/* Get a skbuff (no data, just holds our cb information) */
if ((skb = sock_alloc_send_skb(sk, 0,
msg->msg_flags & MSG_DONTWAIT,
&err)) == NULL) {
mutex_unlock(&econet_mutex);
return err;
}
eb = (struct ec_cb *)&skb->cb;
eb->cookie = saddr->cookie;
eb->timeout = (5*HZ);
eb->start = jiffies;
ah.handle = aun_seq;
eb->seq = (aun_seq++);
eb->sec = *saddr;
skb_queue_tail(&aun_queue, skb);
udpmsg.msg_name = (void *)&udpdest;
udpmsg.msg_namelen = sizeof(udpdest);
udpmsg.msg_iov = &iov[0];
udpmsg.msg_iovlen = msg->msg_iovlen + 1;
udpmsg.msg_control = NULL;
udpmsg.msg_controllen = 0;
udpmsg.msg_flags=0;
oldfs = get_fs(); set_fs(KERNEL_DS); /* More privs :-) */
err = sock_sendmsg(udpsock, &udpmsg, size);
set_fs(oldfs);
#else
err = -EPROTOTYPE;
#endif
mutex_unlock(&econet_mutex);
return err;
}
/*
* Look up the address of a socket.
*/
static int econet_getname(struct socket *sock, struct sockaddr *uaddr,
int *uaddr_len, int peer)
{
struct sock *sk;
struct econet_sock *eo;
struct sockaddr_ec *sec = (struct sockaddr_ec *)uaddr;
if (peer)
return -EOPNOTSUPP;
mutex_lock(&econet_mutex);
sk = sock->sk;
eo = ec_sk(sk);
sec->sec_family = AF_ECONET;
sec->port = eo->port;
sec->addr.station = eo->station;
sec->addr.net = eo->net;
mutex_unlock(&econet_mutex);
*uaddr_len = sizeof(*sec);
return 0;
}
static void econet_destroy_timer(unsigned long data)
{
struct sock *sk=(struct sock *)data;
if (!atomic_read(&sk->sk_wmem_alloc) &&
!atomic_read(&sk->sk_rmem_alloc)) {
sk_free(sk);
return;
}
sk->sk_timer.expires = jiffies + 10 * HZ;
add_timer(&sk->sk_timer);
printk(KERN_DEBUG "econet socket destroy delayed\n");
}
/*
* Close an econet socket.
*/
static int econet_release(struct socket *sock)
{
struct sock *sk;
mutex_lock(&econet_mutex);
sk = sock->sk;
if (!sk)
goto out_unlock;
econet_remove_socket(&econet_sklist, sk);
/*
* Now the socket is dead. No more input will appear.
*/
sk->sk_state_change(sk); /* It is useless. Just for sanity. */
sock_orphan(sk);
/* Purge queues */
skb_queue_purge(&sk->sk_receive_queue);
if (atomic_read(&sk->sk_rmem_alloc) ||
atomic_read(&sk->sk_wmem_alloc)) {
sk->sk_timer.data = (unsigned long)sk;
sk->sk_timer.expires = jiffies + HZ;
sk->sk_timer.function = econet_destroy_timer;
add_timer(&sk->sk_timer);
goto out_unlock;
}
sk_free(sk);
out_unlock:
mutex_unlock(&econet_mutex);
return 0;
}
static struct proto econet_proto = {
.name = "ECONET",
.owner = THIS_MODULE,
.obj_size = sizeof(struct econet_sock),
};
/*
* Create an Econet socket
*/
static int econet_create(struct net *net, struct socket *sock, int protocol)
{
struct sock *sk;
struct econet_sock *eo;
int err;
if (net != &init_net)
return -EAFNOSUPPORT;
/* Econet only provides datagram services. */
if (sock->type != SOCK_DGRAM)
return -ESOCKTNOSUPPORT;
sock->state = SS_UNCONNECTED;
err = -ENOBUFS;
sk = sk_alloc(net, PF_ECONET, GFP_KERNEL, &econet_proto);
if (sk == NULL)
goto out;
sk->sk_reuse = 1;
sock->ops = &econet_ops;
sock_init_data(sock, sk);
eo = ec_sk(sk);
sock_reset_flag(sk, SOCK_ZAPPED);
sk->sk_family = PF_ECONET;
eo->num = protocol;
econet_insert_socket(&econet_sklist, sk);
return(0);
out:
return err;
}
/*
* Handle Econet specific ioctls
*/
static int ec_dev_ioctl(struct socket *sock, unsigned int cmd, void __user *arg)
{
struct ifreq ifr;
struct ec_device *edev;
struct net_device *dev;
struct sockaddr_ec *sec;
int err;
/*
* Fetch the caller's info block into kernel space
*/
if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
return -EFAULT;
if ((dev = dev_get_by_name(&init_net, ifr.ifr_name)) == NULL)
return -ENODEV;
sec = (struct sockaddr_ec *)&ifr.ifr_addr;
mutex_lock(&econet_mutex);
err = 0;
switch (cmd) {
case SIOCSIFADDR:
edev = dev->ec_ptr;
if (edev == NULL) {
/* Magic up a new one. */
edev = kzalloc(sizeof(struct ec_device), GFP_KERNEL);
if (edev == NULL) {
err = -ENOMEM;
break;
}
dev->ec_ptr = edev;
} else
net2dev_map[edev->net] = NULL;
edev->station = sec->addr.station;
edev->net = sec->addr.net;
net2dev_map[sec->addr.net] = dev;
if (!net2dev_map[0])
net2dev_map[0] = dev;
break;
case SIOCGIFADDR:
edev = dev->ec_ptr;
if (edev == NULL) {
err = -ENODEV;
break;
}
memset(sec, 0, sizeof(struct sockaddr_ec));
sec->addr.station = edev->station;
sec->addr.net = edev->net;
sec->sec_family = AF_ECONET;
dev_put(dev);
if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
err = -EFAULT;
break;
default:
err = -EINVAL;
break;
}
mutex_unlock(&econet_mutex);
dev_put(dev);
return err;
}
/*
* Handle generic ioctls
*/
static int econet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
struct sock *sk = sock->sk;
void __user *argp = (void __user *)arg;
switch(cmd) {
case SIOCGSTAMP:
return sock_get_timestamp(sk, argp);
case SIOCGSTAMPNS:
return sock_get_timestampns(sk, argp);
case SIOCSIFADDR:
case SIOCGIFADDR:
return ec_dev_ioctl(sock, cmd, argp);
break;
default:
return -ENOIOCTLCMD;
}
/*NOTREACHED*/
return 0;
}
static struct net_proto_family econet_family_ops = {
.family = PF_ECONET,
.create = econet_create,
.owner = THIS_MODULE,
};
static const struct proto_ops econet_ops = {
.family = PF_ECONET,
.owner = THIS_MODULE,
.release = econet_release,
.bind = econet_bind,
.connect = sock_no_connect,
.socketpair = sock_no_socketpair,
.accept = sock_no_accept,
.getname = econet_getname,
.poll = datagram_poll,
.ioctl = econet_ioctl,
.listen = sock_no_listen,
.shutdown = sock_no_shutdown,
.setsockopt = sock_no_setsockopt,
.getsockopt = sock_no_getsockopt,
.sendmsg = econet_sendmsg,
.recvmsg = econet_recvmsg,
.mmap = sock_no_mmap,
.sendpage = sock_no_sendpage,
};
#if defined(CONFIG_ECONET_AUNUDP) || defined(CONFIG_ECONET_NATIVE)
/*
* Find the listening socket, if any, for the given data.
*/
static struct sock *ec_listening_socket(unsigned char port, unsigned char
station, unsigned char net)
{
struct sock *sk;
struct hlist_node *node;
sk_for_each(sk, node, &econet_sklist) {
struct econet_sock *opt = ec_sk(sk);
if ((opt->port == port || opt->port == 0) &&
(opt->station == station || opt->station == 0) &&
(opt->net == net || opt->net == 0))
goto found;
}
sk = NULL;
found:
return sk;
}
/*
* Queue a received packet for a socket.
*/
static int ec_queue_packet(struct sock *sk, struct sk_buff *skb,
unsigned char stn, unsigned char net,
unsigned char cb, unsigned char port)
{
struct ec_cb *eb = (struct ec_cb *)&skb->cb;
struct sockaddr_ec *sec = (struct sockaddr_ec *)&eb->sec;
memset(sec, 0, sizeof(struct sockaddr_ec));
sec->sec_family = AF_ECONET;
sec->type = ECTYPE_PACKET_RECEIVED;
sec->port = port;
sec->cb = cb;
sec->addr.net = net;
sec->addr.station = stn;
return sock_queue_rcv_skb(sk, skb);
}
#endif
#ifdef CONFIG_ECONET_AUNUDP
/*
* Send an AUN protocol response.
*/
static void aun_send_response(__u32 addr, unsigned long seq, int code, int cb)
{
struct sockaddr_in sin = {
.sin_family = AF_INET,
.sin_port = htons(AUN_PORT),
.sin_addr = {.s_addr = addr}
};
struct aunhdr ah = {.code = code, .cb = cb, .handle = seq};
struct kvec iov = {.iov_base = (void *)&ah, .iov_len = sizeof(ah)};
struct msghdr udpmsg;
udpmsg.msg_name = (void *)&sin;
udpmsg.msg_namelen = sizeof(sin);
udpmsg.msg_control = NULL;
udpmsg.msg_controllen = 0;
udpmsg.msg_flags=0;
kernel_sendmsg(udpsock, &udpmsg, &iov, 1, sizeof(ah));
}
/*
* Handle incoming AUN packets. Work out if anybody wants them,
* and send positive or negative acknowledgements as appropriate.
*/
static void aun_incoming(struct sk_buff *skb, struct aunhdr *ah, size_t len)
{
struct iphdr *ip = ip_hdr(skb);
unsigned char stn = ntohl(ip->saddr) & 0xff;
struct sock *sk;
struct sk_buff *newskb;
struct ec_device *edev = skb->dev->ec_ptr;
if (! edev)
goto bad;
if ((sk = ec_listening_socket(ah->port, stn, edev->net)) == NULL)
goto bad; /* Nobody wants it */
newskb = alloc_skb((len - sizeof(struct aunhdr) + 15) & ~15,
GFP_ATOMIC);
if (newskb == NULL)
{
printk(KERN_DEBUG "AUN: memory squeeze, dropping packet.\n");
/* Send nack and hope sender tries again */
goto bad;
}
memcpy(skb_put(newskb, len - sizeof(struct aunhdr)), (void *)(ah+1),
len - sizeof(struct aunhdr));
if (ec_queue_packet(sk, newskb, stn, edev->net, ah->cb, ah->port))
{
/* Socket is bankrupt. */
kfree_skb(newskb);
goto bad;
}
aun_send_response(ip->saddr, ah->handle, 3, 0);
return;
bad:
aun_send_response(ip->saddr, ah->handle, 4, 0);
}
/*
* Handle incoming AUN transmit acknowledgements. If the sequence
* number matches something in our backlog then kill it and tell
* the user. If the remote took too long to reply then we may have
* dropped the packet already.
*/
static void aun_tx_ack(unsigned long seq, int result)
{
struct sk_buff *skb;
unsigned long flags;
struct ec_cb *eb;
spin_lock_irqsave(&aun_queue_lock, flags);
skb = skb_peek(&aun_queue);
while (skb && skb != (struct sk_buff *)&aun_queue)
{
struct sk_buff *newskb = skb->next;
eb = (struct ec_cb *)&skb->cb;
if (eb->seq == seq)
goto foundit;
skb = newskb;
}
spin_unlock_irqrestore(&aun_queue_lock, flags);
printk(KERN_DEBUG "AUN: unknown sequence %ld\n", seq);
return;
foundit:
tx_result(skb->sk, eb->cookie, result);
skb_unlink(skb, &aun_queue);
spin_unlock_irqrestore(&aun_queue_lock, flags);
kfree_skb(skb);
}
/*
* Deal with received AUN frames - sort out what type of thing it is
* and hand it to the right function.
*/
static void aun_data_available(struct sock *sk, int slen)
{
int err;
struct sk_buff *skb;
unsigned char *data;
struct aunhdr *ah;
struct iphdr *ip;
size_t len;
while ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) {
if (err == -EAGAIN) {
printk(KERN_ERR "AUN: no data available?!");
return;
}
printk(KERN_DEBUG "AUN: recvfrom() error %d\n", -err);
}
data = skb_transport_header(skb) + sizeof(struct udphdr);
ah = (struct aunhdr *)data;
len = skb->len - sizeof(struct udphdr);
ip = ip_hdr(skb);
switch (ah->code)
{
case 2:
aun_incoming(skb, ah, len);
break;
case 3:
aun_tx_ack(ah->handle, ECTYPE_TRANSMIT_OK);
break;
case 4:
aun_tx_ack(ah->handle, ECTYPE_TRANSMIT_NOT_LISTENING);
break;
#if 0
/* This isn't quite right yet. */
case 5:
aun_send_response(ip->saddr, ah->handle, 6, ah->cb);
break;
#endif
default:
printk(KERN_DEBUG "unknown AUN packet (type %d)\n", data[0]);
}
skb_free_datagram(sk, skb);
}
/*
* Called by the timer to manage the AUN transmit queue. If a packet
* was sent to a dead or nonexistent host then we will never get an
* acknowledgement back. After a few seconds we need to spot this and
* drop the packet.
*/
static void ab_cleanup(unsigned long h)
{
struct sk_buff *skb;
unsigned long flags;
spin_lock_irqsave(&aun_queue_lock, flags);
skb = skb_peek(&aun_queue);
while (skb && skb != (struct sk_buff *)&aun_queue)
{
struct sk_buff *newskb = skb->next;
struct ec_cb *eb = (struct ec_cb *)&skb->cb;
if ((jiffies - eb->start) > eb->timeout)
{
tx_result(skb->sk, eb->cookie,
ECTYPE_TRANSMIT_NOT_PRESENT);
skb_unlink(skb, &aun_queue);
kfree_skb(skb);
}